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ADA4620-2ARZ-R7 Folha de dados(PDF) 37 Page - Analog Devices

Nome de Peças ADA4620-2ARZ-R7
Descrição Electrónicos  36 V, Precision, Low Noise, 16.5 MHz JFET Op Amp with Rail-to-Rail Output
PDF  49 Pages
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADA4620-2ARZ-R7 Folha de dados(HTML) 37 Page - Analog Devices

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Data Sheet
ADA4620-1, ADA4620-2
analog.com
Rev. 0
37 of 49
Figure 117. Ideal Gain and Phase Plot of the Transimpedance Amplifier Design with Compensation
The gray trace in Figure 117 shows the ideal noise gain over frequencies for the photodiode preamp. Calculate the
noise bandwidth at the fN frequency by:
������
������ =
������
������������������
(������������ + ������������)/������������
(7)
In reality, noise gain is limited by the gain bandwidth of the op amp, and rolls off with open-loop gain. The gray
trace in Figure 118 shows a more realistic noise gain plot, compared to Figure 117.
Figure 118. Attenuated Noise Gain, with Attenuation Following Open-Loop Gain
OPEN-LOOP GAIN
I-TO-V GAIN
NG = 1
G = 1 + CS/CF
fX
fZ
fN
fGBP
f
f
fP
0°
45°
–45°
90°
–90°
–135°
NG = RFCFs
OPEN-LOOP GAIN
fZ
NG = 1 + CS/CF
NG = RFCFs
NG = 1
log f



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